Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
  • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
  • B29C45/50—Axially movable screw
  • B29C45/5008—Drive means therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
  • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
  • B29C45/50—Axially movable screw
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
  • B29C2045/1792—Machine parts driven by an electric motor, e.g. electric servomotor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/40—Removing or ejecting moulded articles
  • B29C45/4005—Ejector constructions; Ejector operating mechanisms
  • B29C2045/4036—Ejector constructions; Ejector operating mechanisms driven by a screw and nut mechanism
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
  • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
  • B29C45/50—Axially movable screw
  • B29C45/5008—Drive means therefor
  • B29C2045/504—Drive means therefor electric motors for rotary and axial movement of the screw being coaxial with the screw
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/40—Removing or ejecting moulded articles
  • B29C45/4005—Ejector constructions; Ejector operating mechanisms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/64—Mould opening, closing or clamping devices
  • B29C45/66—Mould opening, closing or clamping devices mechanical

Definitions

• the present invention relates to an electric injection molding machine and a molding method using the same.
• the electric injection molding machine includes a mold clamping device, a mold device, and an injection device.
• the mold clamping device includes a stationary platen, a movable platen as a driven portion, and a motor for mold clamping.
• the mold apparatus includes a fixed mold and a movable mold, and the electric motor for mold clamping moves the movable platen forward and backward to move the movable mold toward and away from the fixed mold, thereby closing the mold. Clamping and mold opening can be performed.
• the injection device includes a heating cylinder that heats and melts the resin supplied from the hopper, and an injection nozzle that injects the melted resin, and a driven part is provided in the heating cylinder. Is rotatably arranged and freely reciprocated. Then, the screw is moved forward, the injection nozzle force injects the resin, and the screw is rotated to measure the resin!
• the rotation generated by driving the electric motor for measurement is transmitted to the screw, the screw is rotated, and the screw is retracted accordingly.
• the rotational motion of the rotation generated by driving the motor for injection is transmitted to the ball screw, and the rotational motion is converted into a linear motion by the ball screw, and the linear motion is transmitted to the screw. The transmission is made to advance the screw.
• Patent Document 1 Japanese Patent Application Laid-Open No. 9-267369
• An object of the present invention is to solve the problems of the conventional electric injection molding machine and to provide an electric injection molding machine capable of increasing the responsiveness of a driven part and a molding method using the same.
• the driven part, an electric motor for operating the driven part, and the electric motor are provided between the electric motor and the driven part.
• a motion direction conversion unit that converts the rotational motion of the rotation generated by driving the motor into a linear motion.
• the ratio of the laminated length of the magnets of the rotor to the inner diameter of the stator is set to 3 or more.
• the driven part an electric motor for operating the driven part, and the electric motor are provided between the electric motor and the driven part.
• Drive electric motor And a movement direction conversion unit that converts a rotational movement of the rotation generated by the movement into a linear movement.
• the ratio of the laminated length of the magnets of the rotor to the inner diameter of the stator is set to 3 or more.
• FIG. 1 is a cross-sectional view showing a main part of an injection device of an electric injection molding machine according to a first embodiment of the present invention.
• FIG. 2 is a diagram illustrating characteristics of an injection device of the electric injection molding machine according to the first embodiment of the present invention.
• FIG. 3 is a view showing a main part of an injection device of an electric injection molding machine according to a second embodiment of the present invention.
• FIG. 1 is a cross-sectional view showing a main part of an injection device of an electric injection molding machine according to a first embodiment of the present invention
• FIG. 2 is an injection machine of the electric injection molding machine according to the first embodiment of the present invention
• FIG. 4 is a diagram illustrating characteristics of the device.
• reference numeral 11 denotes a heating cylinder as a cylinder member, and an injection nozzle (not shown) is provided at a front end (left end in FIG. 1) of the heating cylinder 11.
• a screw 12 as a first driven portion and as an injection member is disposed so as to be able to advance and retreat (move in the left-right direction in FIG. 1) and rotate freely.
• the screw 12 has a screw head (not shown) at the front end, extends rearward (to the right in FIG. 1) in the heating cylinder 11, and extends at the rear end (to the right in FIG. 1). It is fixed to the bearing box 13 at the right end).
• a screw (helical) flight (not shown) is formed on the outer peripheral surface of the screw 12, and a groove is formed between the flights.
• a resin supply port (not shown) is formed at a set location in the heating cylinder 11, and a hose (not shown) is fixed to the resin supply port.
• a hose (not shown) is fixed to the resin supply port.
• a heater (not shown) is provided around the heating cylinder 11 so that the heating cylinder 11 can be heated by the heater and the resin in the groove can be melted. Therefore, when the screw 12 is retracted by a predetermined amount as the resin advances, one shot of the melted resin is accumulated in front of the screw head.
• the injection step if the screw 12 is moved forward (moved to the left in FIG. 1) without rotating, the resin accumulated in front of the screw head is injected by the injection nozzle force, It is filled in the cavity space of a mold device (not shown).
• the driving unit 15 includes an injection frame 17, a first motor 22 as a motor for measurement disposed in the injection frame 17, and a second motor as a motor for injection disposed behind the injection frame 17.
• the second motors 22, 23 are arranged on the same axis.
• the injection frame 17 connects the front injection support 18, the rear injection support 19 disposed rearward of the front injection support 18, the front injection support 18 and the rear injection support 19, and A rod 21 is provided at a predetermined distance between the support 18 and the rear injection support 19, and a heating cylinder 11 is mounted on the front end of the front injection support 18 and a first electric motor 22 is mounted on the rear end of the front injection support 18.
• the second electric motor 23 is attached to the rear end of the rear injection support 19 via a load cell 24 as a load detector and an annular presser 25.
• the first electric motor 22 is rotatably supported by a housing 34 including a front flange 31, a rear flange 32, and a cylindrical frame 33, and bearings brl and br2 with respect to the housing 34.
• Reference numeral 38 denotes a stator coil for supplying a current to the stator coil 38.
• the first electric motor 22 can be driven.
• the screw 12 can be rotated by driving the first electric motor 22.
• a female spline 41 as a first engagement element is provided at a predetermined position on the inner peripheral surface of the output shaft 35 (in the present embodiment, the central force in the axial direction of the output shaft 35 is also applied to the rear end). It is formed.
• the bearing box 13 includes a disk-shaped bottom 43 to which the rear end of the screw 12 is attached, and a cylindrical side 44 extending rearward from the outer peripheral edge of the bottom 43.
• the bearing br3—br5 consisting of the last bearing force is housed.
• a male spline 45 as a second engagement element is formed at a predetermined position on the outer peripheral surface of the side portion 44, in the present embodiment, at the rear end (the right end in FIG. 1). .
• the female spline 41 and the male spline 45 are engaged with each other so as to be slidable in the axial direction and non-rotatably in the circumferential direction, and constitute a first rotation transmitting portion.
• the rotation generated on the output shaft 35 by driving the first electric motor 22 is transmitted to the bearing box 13 via the first rotation transmission unit, Further, it is transmitted to the screw 12.
• the screw 12 when the screw 12 is rotated, the resin in the form of pellets is supplied from the inside of the hopper, and the resin enters the heating cylinder 11 and is advanced in the groove. Accordingly, the bearing box 13 is retracted with respect to the output shaft 35 while the female spline 41 and the male spline 45 are engaged, and the screw 12 is retracted. In this way, weighing can be performed.
• a back pressure is applied to the screw 12 against the pressure generated by the resin.
• the second electric motor 23 is rotatably supported by a housing 54 composed of a front flange 51, a rear flange 52, and a cylindrical frame 53, and bearings br6, br7 with respect to the housing 54.
• Reference numeral 58 denotes a stator coil, and the second electric motor 23 can be driven by supplying a current to the stator coil 58.
• the screw 12 can be moved forward without rotating by driving the second electric motor 23. Therefore, the ball screw shaft 'spline shaft unit 61 as a transmission shaft is rotatably supported by the bearings br3-br5 in the bearing box 13, and a thrust load is received by the bearings br3-br5.
• a cylindrical portion 62 is formed at the front end of the ball screw shaft 'spline shaft unit 61.
• a spline shaft portion 68 is formed rearward of the ball screw shaft portion 64 as a screw shaft behind the cylindrical portion 62 as a screw shaft.
• the ball screw shaft 'spline shaft unit 61 is fixed to the ball screw shaft 'spline shaft unit 61 by screwing with a male screw (not shown) formed on the outer peripheral surface of the ball screw shaft' spline shaft unit 61, and bearings br3-br5 It is a nut as a retaining member for preventing the nut from coming off.
• the ball screw shaft 'spline shaft unit 61 has a front end disposed in the first electric motor 22, extends rearward through the rear injection support 19, the load cell 24, and the presser 25, and has a rear end extending in the first direction. It is arranged in the second electric motor 23.
• a through hole 81 is formed in the rear injection support 19, and a ball nut 63 as a nut is attached to the rear injection support 19 via the load cell 24 in the through hole 81, and the ball nut 63 and the ball screw axis
• the part 64 is screwed.
• the ball nut 63 and the ball screw shaft 64 constitute a ball screw.
• the ball screw functions as a linear motion in which the rotary motion is linearly moved while rotating, that is, a motion direction conversion unit that converts the rotary motion into a linear motion.
• the ball nut 63 converts the first conversion element into a ball screw shaft.
• 64 constitutes the second conversion element.
• a roller screw may be used instead of the ball screw as the movement direction conversion unit.
• an aperture nut is used instead of the ball nut 63 as the first conversion element and the nut
• a roller screw shaft is used instead of the ball screw shaft 64 as the second conversion element and the screw shaft.
• a cylindrical locking portion 66 is provided in the output shaft 55, and the locking portion 66 is fixed to the output shaft 55 and extends to a position near the rear end force front end of the output shaft 55.
• a female spline 67 is formed as a first engagement element.
• the female spline 67 and the male spline 69 as a second engagement element formed on the outer peripheral surface of the spline shaft portion 68 are spline-connected.
• the female spline 67 and the male spline 69 are engaged with each other so as to be slidable in the axial direction and non-rotatably in the circumferential direction, and constitute a second rotation transmitting portion.
• An encoder 71 as a rotation speed detecting unit is attached to the rear end of the locking unit 66, and the output shaft 55, the ball screw shaft 'spline shaft unit 61, and the rotation of the second electric motor 23 are rotated by the encoder 71. Speed is directly detected. Therefore, the position of the ball screw shaft 'spline shaft unit 61 can be calculated based on the rotation speed of the ball screw shaft' spline shaft unit 61 in a control unit (not shown).
• the rotation generated on the output shaft 55 by driving the second electric motor 23 is transmitted to the locking portion 66, and further transmitted to the ball screw shaft via the second rotation transmitting portion.
• the rotational motion is transmitted to the spline shaft unit 61, and the rotational motion is converted into the rotational linear motion by the ball screw, and the rotational linear motion is transmitted to the bearing box 13.
• the bearing box 13 has a structure in which the ball screw shaft 'spline shaft unit 61 is rotatably supported by at least three bearings br3-br5. Is output, and the linear motion is transmitted to the screw 12.
• the thrust load in the direction in which the screw 12 moves forward is received by at least two bearings br4 and br5, and the thrust load in the direction in which the screw 12 moves backward is received by at least one bearing br3. That is, since the thrust load is received by at least three bearings br3-br5, the outer diameter of the bearing component rotating together with the ball screw shaft portion 64 can be reduced. Therefore, the rotational inertia can be reduced.
• the inner diameter Dm of the stator 57 is increased in the second electric motor 23 or the ball screw is mounted. If the diameter Ds of the ball screw shaft 64, which represents the diameter of the screw shaft, is increased, the inertia generated in the second motor 23 (the output shaft 55, the rotor 56, the Inertia) and the inertia of the ball screw shaft 'spline shaft unit 61 are correspondingly increased, and the responsiveness of the screw 12 and the responsiveness at the rise of the injection speed are reduced accordingly.
• the inner diameter Dm and the diameter Ds are reduced to increase the responsiveness of the screw 12 and the responsiveness of the rise of the injection speed, and the inner diameter Dm and the diameter Ds are reduced.
• the lamination length Lm of the magnet for example, the permanent magnet in the second electric motor 23 and the length Ls of the thread portion of the ball nut 63 in the ball screw are increased. I have to.
• the lamination length Lm is a condition that can be reached when the stator coil 58 is wound from the inside of the stator 57
• the length Ls is a condition that can be reached when the inner peripheral surface of the ball nut 63 is polished. Is set.
• the diameter Ds is represented by the distance between the centers of the balls in the ball nut 63 when the ball is placed farthest away, and is set under the condition that the ball screw shaft 64 does not buckle. . Note that the length Ls is formed in the ball nut 63! , U.
• the torque TM of the second electric motor 23 is the square of the inner diameter Dm and the lamination length Lm And is proportional to the value obtained by multiplying by
• TM kl -Dm 2 -Lm
• the number of laminated plates constituting the stator 57 may be increased, a steel pipe may be used for the output shaft 55, or a plurality of shaft elements may be connected.
• the dynamic load rating Wn of the ball screw is determined by the diameter and the number of the balls to be loaded, and is proportional to the value obtained by multiplying the diameter Ds by the length Ls, and can be expressed by the following equation. it can.
• the second electric motor 23 one having a ratio ⁇ ⁇ of the lamination length Lm to the inner diameter Dm of 3 or more is used, and as the ball screw, the length Ls of the length Ds to the diameter Ds is used. Make sure that the ratio ⁇ s is 3 or more!
• the ratios ⁇ s and ⁇ m are increased, the responsiveness of the screw 12 and the injection speed can be increased.
• the ratios ⁇ 3 and ⁇ ⁇ be within “10”, and it is realistic to keep them within “5”.
• the ratios ⁇ 3 and ⁇ ⁇ be within “10”, and it is realistic to keep them within “5”.
• the ratios ⁇ 3 and ⁇ ⁇ be within “10”, and it is realistic to keep them within “5”.
• the ratios ⁇ 3 and ⁇ ⁇ be within “10”, and it is realistic to keep them within “5”.
• the larger the axial length the more difficult it is to machine the inner peripheral surface. Therefore, conventionally, a plurality of ball nuts are connected to increase the axial length.
• the acceleration g can be sufficiently increased. Can be done. Accordingly, it is possible to sufficiently increase the responsiveness of the screw 12 and the rising of the injection speed that can generate a sufficient injection pressure.
• FIG. 3 is a view showing a main part of an injection device of an electric injection molding machine according to a second embodiment of the present invention.
• the injection frame 17 includes a front injection support 18, a rear injection support 19 disposed behind the front injection support 18, and a connection between the front injection support 18 and the rear injection support 19.
• a rod 21 is provided at a predetermined distance between the injection support 18 and the rear injection support 19.
• a heating cylinder 11 as a cylinder member is attached to the front end of the front injection support 18, and a presser plate 101 as a pressing member and a load cell retainer 102 as a load detector support are provided along the rod 21 with bushings 111, respectively.
• 112 slidably and reciprocally, and a first motor 122 as a weighing motor is attached to the pressure plate 101.
• the load cell 24 as a load detector is sandwiched between the pressure plate 101 and the load cell retainer 102, and the outer peripheral edge of the load cell 24 is fixed by bolts btl.
• a second electric motor 23 as an electric motor for injection is attached to the rear end of the rear injection support 19.
• the screw 12 can be rotated by driving the first electric motor 122.
• the rotating member 105 is rotatably supported by the bearings brl 1 and brl 2 with respect to the pressure plate 101, and the screw 12 is fixed to the disk portion 106 of the rotating member 105.
• a drive pulley 124 as a drive element is attached to an output shaft 123 of the first electric motor 122, and a driven pulley 125 as a driven element is attached to the cylindrical portion 107 of the rotating member 105.
• a timing belt 126 as a transmission member is stretched between the driven pulley 125 and the driven pulley 125.
• the second electric motor 23 is rotatably supported by a housing 54 including a front flange 51, a rear flange 52, and a cylindrical frame 53, and bearings br6, br7 with respect to the housing 54.
• a solid output shaft 155, a rotor 56 attached to the output shaft 155, a stator 57 attached to the frame 53 by forming a gap between the output shaft 155 and the rotor 56, and the front flange 51 is bolted bt2 It is attached to the injection frame 17 by fixing it to the rear injection support 19.
• a through hole 131 is formed at a predetermined position of the rear injection support 19
• a bearing holder 132 is provided in the through hole 131, and the bearing holder 132 is fixed to the front flange 51 by bolts bt3.
• a ball screw shaft 'spline shaft unit 161 as a transmission shaft is rotatably supported in the bearing holder 132 by bearings brl3 and brl5 which also have at least three thrust bearing forces as a transmission shaft support portion. Thrust load is received.
• At least two bearings brl3 and brl4 receive the thrust load in the direction in which the screw 12 moves forward, and at least one bearing brl5 receives the thrust load in the direction in which the screw 12 moves backward. That is, since the thrust load is received by at least three bearings brl3-br15, the outer diameter of the bearing component rotating together with the ball screw shaft 162 can be reduced. Therefore, the rotational inertia can be reduced.
• a large-diameter ball screw shaft portion 162 as a screw shaft is provided at the front half of the ball screw shaft and spline shaft unit 161, and a medium-diameter cylindrical portion 163 is provided behind the ball screw shaft portion 162.
• a small diameter spline shaft portion 164 is formed behind the cylindrical portion 163.
• 166 is a holding plate as a first retaining member for preventing the bearings brl3 and brl4 from coming off the bearing holder 132.
• This is a lock nut as a second retaining member that is fixed to the ball screw shaft 'spline shaft unit 161 by screwing with a male screw and prevents the bearing brl5 from coming off.
• the ball screw shaft 'spline shaft unit 161 is overlapped with the first electric motor 122 in the axial direction, extends rearward through the load cell 24, the rear injection support 19, the bearing holder 132, and the like. Is disposed in the second electric motor 23.
• a ball nut 173 as a nut is attached to the ball screw support 113, and the ball nut 173 and the ball screw shaft 162 are screwed together.
• a ball screw is formed by the ball nut 173 and the ball screw shaft 162.
• the ball screw functions as a movement direction conversion unit that converts a rotational movement into a linear movement.
• a first conversion element is configured by the ball nut 173, and a second conversion element is configured by the ball screw shaft 162.
• a roller screw can be used instead of the ball screw as the movement direction conversion unit.
• a roller nut is used instead of the ball nut 173 as the first conversion element and the nut
• a roller screw shaft is used instead of the ball screw shaft 162 as the second conversion element and the screw shaft.
• a female spline as a first engagement element is formed at a front end in the output shaft 155.
• the female spline and a male spline as a second engagement element formed on the outer peripheral surface of the spline shaft portion 164 are spline-connected.
• the female spline and the male spline are engaged with each other immovably in the axial direction and non-rotatably in the circumferential direction, and constitute a second rotation transmission unit.
• an encoder 71 as a rotation speed detecting unit is mounted, and the output shaft 155, the ball screw shaft and the spline shaft hood are mounted by the encoder 71. G 161 and the rotation speed of the second electric motor 23 are directly detected. Therefore, not shown
• V in the control unit, based on the rotation speed of the ball screw shaft / spline shaft unit 161
• the position of the ball nut 173 can be calculated.
• the inner diameter Dm of the stator 57 of the second electric motor 23 is increased or the ball screw is used.
• the diameter Ds of the ball screw shaft portion 64 representing the diameter of the screw shaft the inertia generated in the second electric motor 23 (the inertia of the output shaft 155, rotor 56, etc.) is reduced.
• the inertia of the spline shaft unit 161 and the ball screw shaft 'spline shaft unit 161 increases accordingly, and the responsiveness of the screw 12 and the responsiveness of the rise of the injection speed decrease accordingly.
• the inner diameter Dm and the diameter Ds are reduced to increase the responsiveness of the screw 12 and the responsiveness of the rise of the injection speed, and the inner diameter Dm and the diameter Ds are reduced.
• the lamination length Lm of the magnet for example, the permanent magnet in the second electric motor 23 and the length Ls of the thread portion of the ball nut 63 in the ball screw should be increased. And then.
• the second electric motor 23 one having a ratio ⁇ m of the lamination length Lm to the inner diameter Dm of 3 or more is used, and a ratio ⁇ s of the length Ls to the diameter Ds of the ball screw is 3 or more I try to use
• the present invention can be applied to a motor as a drive unit and a ball screw as a movement direction conversion unit.
• the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and does not exclude the scope of the present invention.
• the present invention can be applied to an electric injection molding machine.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Permanent Magnet Type Synchronous Machine (AREA)

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Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

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ID=34463192

Family Applications (1)

Country Status (7)

Cited By (11)

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Citations (4)

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• 2004
  • 2004-10-15 KR KR1020067007073A patent/KR100751825B1/ko not_active Expired - Fee Related
  • 2004-10-15 WO PCT/JP2004/015241 patent/WO2005037519A1/ja active Application Filing
  • 2004-10-15 US US10/574,792 patent/US20070009630A1/en not_active Abandoned
  • 2004-10-15 JP JP2005514790A patent/JP4365371B2/ja not_active Expired - Lifetime
  • 2004-10-15 CN CNB2004800304815A patent/CN100491105C/zh not_active Expired - Lifetime
  • 2004-10-15 TW TW093131316A patent/TWI248394B/zh not_active IP Right Cessation
  • 2004-10-15 EP EP04792458A patent/EP1674233B1/en not_active Expired - Lifetime
• 2008
  • 2008-03-11 US US12/073,854 patent/US20080166446A1/en not_active Abandoned

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